According to that great bastion of impartiality and objectivity, Wiki:

"A theodolite is an instrument for measuring both horizontal and vertical angles, as used in triangulation networks. It is a key tool in surveying and engineering work, but theodolites have been adapted for other specialized purposes in fields like meteorology and rocket launch technology. A modern theodolite consists of a telescope mounted movably within two perpendicular axes, the horizontal or trunnion axis, and the vertical axis. When the telescope is pointed at a desired object, the angle of each of these axes can be measured with great precision, typically on the scale of arcseconds."

Theodolites, or directors as they were also know were used extensively before GPS came into general use. Each Battery had a Survey Sgt who would use a director for laying on the Guns. There was also a dedicated Survey Troop based at RSA Larkhill, although I believe that nowadays they are laid up and largely defunct, with the associated knowledge of their use rapidly dissappearing.

Theodolites, or directors as they were also know were used extensively before GPS came into general use. Each Battery had a Survey Sgt who would use a director for laying on the Guns. There was also a dedicated Survey Troop based at RSA Larkhill, although I believe that nowadays they are laid up and largely defunct, with the associated knowledge of their use rapidly dissappearing.

Theodolites, or directors as they were also know were used extensively before GPS came into general use. Each Battery had a Survey Sgt who would use a director for laying on the Guns. There was also a dedicated Survey Troop based at RSA Larkhill, although I believe that nowadays they are laid up and largely defunct, with the associated knowledge of their use rapidly dissappearing.

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I think you'll find every field regiment in the artillery had a dedicated survey troop. That was the case up to the late 1980s, but I'm not too sure of the state of play today.